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// HACK(eddyb) easier dep-tracking if we let `rustc` do it.
const SRC_LIB_RS_CONTENTS: &str = include_str!("src/lib.rs");
const EXPECTED_SRC_LIB_RS_PREFIX: &str = "\
//! Port of LLVM's APFloat software floating-point implementation from the
//! following C++ sources (please update commit hash when backporting):
//! <https://github.com/llvm/llvm-project/commit/";
fn main() {
// HACK(eddyb) disable the default of re-running the build script on *any*
// change to *the entire source tree* (i.e. the default is roughly `./`).
println!("cargo:rerun-if-changed=build.rs");
let llvm_commit_hash = SRC_LIB_RS_CONTENTS
.strip_prefix(EXPECTED_SRC_LIB_RS_PREFIX)
.ok_or(())
.map_err(|_| format!("expected `src/lib.rs` to start with:\n\n{EXPECTED_SRC_LIB_RS_PREFIX}"))
.and_then(|commit_hash_plus_rest_of_file| {
commit_hash_plus_rest_of_file
.split_once('\n')
.ok_or("expected `src/lib.rs` to have more than 3 lines")?
.0
.strip_suffix(">")
.ok_or("expected trailing hyperlink anchor `>`".into())
})
.and_then(|commit_hash| {
if commit_hash.len() != 40 || !commit_hash.chars().all(|c| matches!(c, '0'..='9'|'a'..='f')) {
Err(format!("expected `src/lib.rs` to have a valid commit hash, found {commit_hash:?}"))
} else {
Ok(commit_hash)
}
})
.unwrap_or_else(|e| {
eprintln!("\n{e}\n");
panic!("failed to validate `src/lib.rs`'s commit hash (see above)")
});
let expected_version_metadata = format!("+llvm-{}", &llvm_commit_hash[..12]);
let actual_version = env!("CARGO_PKG_VERSION");
if !actual_version.ends_with(&expected_version_metadata) {
eprintln!("\nexpected version ending in `{expected_version_metadata}`, found `{actual_version}`\n");
panic!("failed to validate Cargo package version (see above)");
}
}
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